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Jonathan Wakely 8db7a05fd7 PR libstdc++/69724 avoid temporary in std::thread construction 
The std::thread constructor creates (and then moves) an unnecessary
temporary copy of each argument. Optimize it to only make the one copy
that is required.

	PR libstdc++/69724
	* include/std/thread (thread::_State_impl, thread::_S_make_state):
	Replace single _Callable parameter with variadic _Args pack, to
	forward them directly to the tuple of decayed copies.
	* testsuite/30_threads/thread/cons/69724.cc: New test.

From-SVN: r271166
2019-05-14 13:01:15 +01:00
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PR libstdc++/69724 avoid temporary in std::thread construction
2019-05-14 13:01:15 +01:00
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